<template>
  <div>
    <div class="shopcart">
      <div class="content"
           @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo"
                 :class="{'highlight':totalCount>0}">
              <i class="icon-shopping_cart"
                 :class="{'highlight':totalCount>0}"></i>
            </div>
            <div class="num"
                 v-show="totalCount>0">
              <bubble :num="totalCount"></bubble>
            </div>
          </div>
          <div class="price"
               :class="{'highlight':totalPrice>0}">￥{{totalPrice}}元</div>
          <div class="desc">另需配送费¥{{deliveryPrice}}元</div>
        </div>
        <div class="content-right"
             @click="pay">
          <div class="pay"
               :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>
      <div class="ball-container">
        <div v-for="(ball,index) of balls"
             :key="index">
          <transition name="drop"
                      @before-enter="beforeDrop"
                      @enter="dropping"
                      @after-enter="afterDrop">
            <div v-show="ball.show"
                 class="ball">
              <div class="inner inner-hook"></div>
            </div>
          </transition>
        </div>
      </div>
      <!-- <transition name="fold">
        <div class="shopcart-list"
             v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty"
                  @click="empty">清空</span>
          </div>
          <div class="list-content"
               ref="listContent">
            <ul>
              <li class="food border-bottom"
                  v-for="(food,index) of selectFoods"
                  :key="index">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-control :food="food"></cart-control>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
       -->
    </div>
    <!-- <transition name="fade">
      <div class="list-mask"
           @click="hideList"
           v-show="listShow"></div>
    </transition> -->
  </div>
</template>

<script>
import Bubble from 'components/bubble/bubble'

const BALL_LEN = 10
const innerClsHook = 'inner-hook'

function createBalls () {
  const ret = []
  for (let i = 0; i < BALL_LEN; i++) {
    ret.push({
      show: false
    })
  }
  return ret
}
export default {
  name: 'Shopcart',
  data () {
    return {
      balls: createBalls(),
      listFold: this.fold
    }
  },
  components: {
    Bubble
  },
  props: {
    selectFoods: {
      type: Array,
      default: () => []
    },
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 0
    },
    fold: {
      type: Boolean,
      default: true
    },
    sticky: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    totalPrice () {
      let total = 0
      this.selectFoods.forEach((food) => {
        total += food.price * food.count
      })
      return total
    },
    totalCount () {
      let count = 0
      this.selectFoods.forEach((food) => {
        count += food.count
      })
      return count
    },
    payDesc () {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元起送`
      } else if (this.totalPrice < this.minPrice) {
        const diff = this.minPrice - this.totalPrice
        return `还差￥${diff}元起送`
      } else {
        return '去结算'
      }
    },
    payClass () {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough'
      } else {
        return 'enough'
      }
    }
  },
  created () {
    this.dropBalls = []
  },
  watch: {
    fold (newVal) {
      this.listFold = newVal
    },
    totalCount (newVal) {
      if (!this.listFold && !newVal) {
        this._hideShopCartList()
      }
    }
  },
  methods: {
    hideList () {
      this.fold = true
    },
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0
      })
    },
    pay (e) {
      if (this.totalPrice < this.minPrice) {
        return
      }
      this.$createDialog({
        title: '支付',
        content: `您需要支付共${this.totalPrice}元`
      }).show()
      e.stopPropagation()
    },
    toggleList () {
      if (this.listFold) {
        if (!this.totalCount) {
          return
        }
        this.listFold = false
        this._showShopCartList()
        this._showShopCartSticky()
      } else {
        this.listFold = true
        this._hideShopCartList()
      }
    },
    _showShopCartList () {
      this.shopCartListComp = this.$createShopCartList({
        $props: {
          selectFoods: 'selectFoods'
        },
        $events: {
          hide: () => {
            this.listFold = true
          },
          leave: () => {
            this._hideShopCartSticky()
          },
          add: el => {
            this.shopCartStickyComp.drop(el)
          }
        }
      }).show()
    },
    _hideShopCartList () {
      const comp = this.sticky ? this.$parent.list : this.shopCartListComp
      // 查看food时，没有创建shopCartList，监听totalCount，执行_hideShopCartList时，会找不到this.$parent.list，直接判断comp.hide，会报错，故加上comp的判断
      comp && comp.hide && comp.hide()
    },
    _hideShopCartSticky () {
      this.shopCartStickyComp.hide()
    },
    _showShopCartSticky () {
      this.shopCartStickyComp = this.$createShopCartSticky({
        $props: {
          selectFoods: 'selectFoods',
          deliveryPrice: 'deliveryPrice',
          minPrice: 'minPrice',
          fold: 'listFold',
          list: this.shopCartListComp
        }
      }).show()
    },
    drop (el) {
      for (let i = 0; i < this.balls.length; i++) {
        const ball = this.balls[i]
        if (!ball.show) {
          ball.show = true
          ball.el = el
          this.dropBalls.push(ball)
          return
        }
      }
    },
    beforeDrop (el) {
      const ball = this.dropBalls[this.dropBalls.length - 1]
      const rect = ball.el.getBoundingClientRect()
      const x = rect.left - 32
      const y = -(window.innerHeight - rect.top - 22)
      el.display = ''
      el.style.transform = el.style.webkitTransform = `translate3d(0,${y}px,0)`
      const inner = el.getElementsByClassName(innerClsHook)[0]
      inner.style.transform = inner.style.webkitTransform = `translate3d(${x}px,0,0)`
    },
    dropping (el, done) {
      /* eslint-disable no-unused-vars */
      this._reflow = document.body.offsetHeight
      el.style.transform = el.style.webkitTransform = 'translate3d(0,0,0)'
      const inner = el.getElementsByClassName(innerClsHook)[0]
      inner.style.transform = inner.style.webkitTransform = 'translate3d(0,0,0)'
      el.addEventListener('transitionend', done)
    },
    afterDrop (el) {
      const ball = this.dropBalls.shift()
      if (ball) {
        ball.show = false
        el.style.display = 'none'
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
@import 'common/stylus/icon.styl'
@import '~common/stylus/variable'
.shopcart
  height 100%
  .content
    display flex
    background #141d27
    font-size 0
    color rgba(255, 255, 255, 0.4)
    .content-left
      flex 1
      .logo-wrapper
        display inline-block
        vertical-align top
        position relative
        top -10px
        margin 0 12px
        padding 6px
        width 56px
        height 56px
        box-sizing border-box
        border-radius 50%
        background #141d27
        .logo
          width 100%
          height 100%
          border-radius 50%
          text-align center
          background #2b343c
          &.highlight
            background rgb(0, 160, 220)
          .icon-shopping_cart
            line-height 44px
            font-size 24px
            color #80858a
            &.highlight
              color #fff
        .num
          position absolute
          top 0
          right 0
          width 24px
          height 16px
          line-height 16px
          text-align center
          border-radius 9px
          font-size 9px
          font-weight 700
          color #fff
          background rgb(240, 20, 20)
          box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
      .price
        display inline-block
        vertical-align top
        margin-top 12px
        line-height 24px
        padding-right 12px
        box-sizing border-box
        border-right 1px solid rgba(255, 255, 255, 0.1)
        font-size 16px
        font-weight 700
        &.highlight
          color #fff
      .desc
        display inline-block
        vertical-align top
        margin 12px 0 0 12px
        line-height 24px
        font-size 10px
    .content-right
      flex 0 0 105px
      width 105px
      .pay
        height 48px
        line-height 48px
        text-align center
        font-size 12px
        font-weight 700
        background #2b333b
        &.not-erough
          background #2b333b
        &.enough
          background #00b43c
          color #fff
  .ball-container
    .ball
      position fixed
      left 32px
      bottom 22px
      z-index 200
      transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
      .inner
        width 16px
        height 16px
        border-radius 50%
        background rgb(0, 160, 220)
        transition all 0.4s linear
  .shopcart-list
    position absolute
    left 0
    top 0
    z-index -1
    width 100%
    transform translate3d(0, -100%, 0)
    &.fold-enter-acitve, &.fold-leave-active
      transition all 0.5s
    &.fold-enter, &.fold-leave-to
      transform translate3d(0, 0, 0)
    .list-header
      height 40px
      line-height 40px
      padding 0 18px
      background #f3f5f7
      border-bottom 1px solid rgba(7, 17, 27, 0.1)
      .title
        float left
        font-size 14px
        color rgb(7, 17, 27)
      .empty
        float right
        font-size 12px
        color rgb(0, 160, 220)
    .list-content
      padding 0 18px
      max-height 217px
      overflow hidden
      background #fff
      .food
        position relative
        padding 12px 0
        box-sizing border-box
        .name
          line-hieght 24px
          font-size 14px
          color rgb(7, 17, 27)
        .price
          position absolute
          right 90px
          bottom 12px
          line-height 24px
          font-size 14px
          font-weight 700
          color rgb(240, 20, 20)
        .cartcontrol-wrapper
          position absolute
          right 0
          bottom 6px
.list-mask
  position fixed
  top 0
  left 0
  width 100%
  height 100%
  z-index 40
  backdrop-filter blur(10px)
  opacity 1
  background rgba(7, 17, 27, 0.6)
  &.fade-enter-active, &.fade-leave-active
    transition all 0.5s
  &.fade-enter, &.fade-leave-to
    opacity 0
    background rgba(7, 17, 27, 0)
</style>
